Revert "libstagefright: Avoid negative values for cttsOffsetTimeUs"
* Taking upstream impl
This reverts commit bd8158a5.
Revert "libstagefright: update cttsOffsetTimeUs for video track"
This reverts commit 60314aed.
Revert "libstagefright: Use proper ctts offset"
This reverts commit 9d63d49e.